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The team???s findings show that the neural genes in ctenophores and sponges are similar, though the sponges do not in fact have a nervous system. So, it???s possible that the ctenophores and sponges??? common ancestor had a nervous system. That ancestor???s neural genes were then passed to both ctenophores and sponges, but were expressed in just the ctenophores. In other words, this ancient organism, now extinct, could have been more sophisticated than scientists had thought.